It may also depend on the recipient carrier or device. Some messages may simply be split, then reassembled by the phone at the other end. Some may be assembled as an MMS and sent as a whole message. I remember in days of yore getting long messages out of order, and having to figure out which order to align them. MMS prevents such gaffes.
I don't believe you have any control over the way the message is handled, unless you want to send your messages in little packets of less than 140 characters.
I remember in days of yore getting long messages out of order, and having to figure out which order to align them.
Lol. Those days made parental freaking out a lot harder, when messages came in like:
(2) up a tree
(3) we named him Cheeko
(1) we found a bear cub
With nowadays texting technology I can freakout in proper time and order.
There are a few reasons why a text message would get converted to what is called "Text as MMS":
1. The message is super long and your device decides to use MMS as the transport instead of SMS
2. You are sending text message with emoticons / emojis
3. You are sending a text to multiple people at the same time (Group Messaging)
The conversion usually depends on the device that you are using and can vary from device to device. I hope this helps.